Draw-off or filling connection, particularly for drums, tanks, or the like



Aug..20, 1935. D. MACL ACHLAN EF AL 2,012,197 DRAW-OFF OR FILLING CONNECTION, PARTICULARLY FOR DRUMS, TANKS OR THE LIKE Filed June 22, 1934 fig ,2.

//v VEN TOPS DA V/D MACLACHLA/V, AND

W/IL T5,? HOW/E. -%V

I I 4 v V on the central tube or conduit may be provided 'largeorsmall. H According to the iinvention, the draw-off or- 1 Patented Aug. 20,1935 V I UNI-TED"5'STATES DRAW-OFF'ORVFILLINGCONNECTION, PAR;

. 'TICULARLY IFOR -DRUMS, TA Sg EE .LIKE I 4 David Maclachlan and walter flowie,"Johannes:-

V a I -burg,,llnion'of South Africa Application June 22,- 1934.:seriar1xo; 731.950; 'Inthe UnionpfSouth Africa M-ay14, 1 934; i

invention relates to'an; improved draw-" off or filling connection, particularly for drums, tanks orthe like containing inflammable or readilyvaporizable liquids. One object ofnthe .invention isto provide a draw-ofi or filling co'nnectionwhich Willeliminate or reduce asiar as possible free contact of the inflammable liquid orithe like with the outer atmosphere and 'thus reduce, :for example, the

risk otfire. A further. object of the invention is toenable a firm air-tight joint'to, be made at the. connection in all cases whether or not the:

hole or' opening in the container or the likeis filling connection comprises a' central tube or conduit one end of which is formed or associated} .with a tapering or other helix and theother end of which is providedwith a clamping fian'ge, the arrangement being such that the: helix can be threaded through an opening in the container or the like so that by screwing or forcing downthe container. The screw thread or helix-on the cen.

tral tube or conduit may be integrally 'or'otherwise connected therewith only at its lower or inner'end and may 'extendiup'ward's' or outwardsso that'it duit.

surrounds but does not touch'the upwarm 'or outwardly extending portion of the tube. or conhelix 'is tapered so that the corresponding .convolution presents a surface parallelto the. edge or wall of thecontainer. The innermost convolution of the helix may likewise be tapered'so that engagement with-the edge of the" opening inthe container may be'efiected readily. I I 1 In accordance with a'further feature of the invention, the flange screwed or axially movable with a passage for the'inlet or outlet of air or vapour into or from the container or'the like and maybe provided with a hit-and-mi'ss or other valveto control such passage. Y Y

" A preferred embodiment of my invention, as applied to a hand pump for drawing off paraffin from a sealed can; will now be described, by way of example, with referenceto the accompanying -drawing,in.which: 3 I

'tainer in which it is inserted: i I

Preferably; the free'or outer. end of, t h'e Fi .1;is aside. View of the embodimentt showing also adjacent parts of the hand-pump;

Fig-"21s avertical, half-section corresponding to Fig. l,'the'section-.b"eing taken through said fig- .ure parallelto theplanethereof;

' Fig. 3 is ajplan view corresponding ;to Fig. 1,

With: the clampinggfiange and associated upper parts removed. 1

: Referring toythejdrawing .The connection "comprises a metal; helix 1 of divergent funnel j shape "formed integral with the upperend of a tubular cap 2 jwhose lower end 3, is threaded upon the top;of thebarrel 4 of the handpump; ,Such cap 2; has" its, upper end interiorly screw-threaded at 5 so asto'. receive the lower-screwedend .of, a tube 6 upon which is threadedaafiange 1 adapted; to be moved towards orraway fromathe .upper enduof theg helix i. by screwing thetube 6 and cap Zrelatively to each other. The lower surface ofthe flange i is re- I cessed to accommodate a leather or other packing ring 78, and, its inner portionis provided with a conical part ,lazzso aslto-makethe connection selfcenteringiwith respectto the, opening in the con- .A valve ring 9 is 'rotatably mounted on the flange 1 so that an aperture l0 therein can be turned into or out ofgregister with the adjacentend-of-an; air passage I, withinlimits permitted 1 by the pineand-slotarrangement [2.

In use, theparaflincan (not'shown) has a hole cut therein by cutters of ,the ordinary tinopener type. (not shown) fixed-on the bottom end lowered into, the can and rotated-so as toeng'age the slotl3betweentheconvolutions of thefhelix l v with the edge ofthe hole. Such rotation results in they helix being; completely threaded into the can untiltheyupper, surface ofthe top convolution M, lies under the top-of the .can.. The flange? is then screwed down so. as to'grip the top of the can-firmly between such fiange and the helix i.

' Parafifin can-thenrbe withdrawn from the can by operation in known .manner of the pump rod IS without risk of fire,-the only communication between thejinterior of the "can and the atmosphere being through the small passage i I.

Variougmodifications maybe made in the connection without departing fromthe scope of thefinvention. For example, the helix may be ofthepump barrel l whereafter the barrel is formeddntegral with the tube G instead of the cap 2, and in'either ease maybe made integral Withsuch part 6" or 2 from head :to foot, the bottom of thehelicali slot 13 betweenrthe-con volutions; being madeihmughout of a diameter drain or branch from an oil pipe or sump; and such drums, cans, tanks, pipes, sumps or the' like to which the connection is temporarily or permanently applied are referred to in the claims simply by the term container.

As will be understood, the invention enables.

large diameter joints to be effected at relatively small diameter holes, and the larger jointing surfaces thus made available provide ,greatersecurity against air or other leakage than would be otherwise possible.

I claim:

-1. A draw-off and filling connection for a container having an opening provided therein, comprising, in combination, a central conduit adapted to pass through said opening, a helicalstrip connected only at its lower end with said conduit and having its convolutions extending freely in gradually increasing diameter up and around said conduit, a clamping flange member provided on said conduit, and means whereby the part of said container surrounding said opening can be firmly gripped between the flange of said flange member and the resilient upper convolutions of said helical strip, to form' a gas-tight joint between the interior of said'container and the atmosphere. r

2. A draw-off and filling connection for a container having an opening provided therein, comthe strip for effecting self-centering or" the con-- nection with respect to said opening, such means being penetrated by a passage connecting the interior of said container with the atmosphere, means whereby the part of said container surrounding said opening can be firmly gripped between said flange and top convolution ofthe strip to form a gas-tight joint between the interior of said container and the atmosphere, and valve means for controlling the flow of air through said passage. 3. A draw-off and filling connection for a container having a circular opening provided therein, comprising, in combination, a central conduit adapted to pass through said opening, a helical strip connected at its lower end with said conduit and having its convolutions extending in increasing diameter up and around said conduit in such manner that the distance between the outermost edge of the top convolution and the remote side of the tube is substantially equal to the diameter of said opening, a clamping flange member screw-threaded on said conduit and having a passage therein connecting the interior of said container with the atmosphere, and means whereby said member can be screwed so as firmly to grip between its flange and the resilient upper convolutions of said helical strip, the part of'said container surrounding said opening, to form a gas-tight joint between the interior of said container and the atmosphere.

4. A draw-off and filling connection for a container having an opening provided therein, comprising, in combination, a central conduit adapted to pass through said opening, a hollow frustoconical member coaxial with said conduit, said member being connected at its end of smallest diameter with said conduit and having the interior portion of its end of largest diameter spaced from the conduit and of a diameter larger than said opening, saidirusto-conical member having a helical slot extending from one end to the other to serve as a screw for introducing the con- Q nection into the opening, said slot extending laterally through the wall of the frusto-conical memher. to Iavoid increasing the diameter of the openingin the container as the same is threaded "I into said opening, and means cooperating with conical member coaxial with said conduit, said.

member being connected at its end of smallest diameter with said conduit and having the interior portion of its end of largest diameter spaced from the conduit and of a diameter larger than said opening, said 'frusto-conical member having a helical slot extending from one end to the other to serve as a screw for introducing the connection into the opening, said slot extending laterally through. the wall of the frusto-conical member to avoid increasing the diameter of the opening in thecontainer as the same-is threaded into said opening, and. a clamping member threadedly mounted on said conduit adapted to cooperate with the largest end of the frusto-conical member to secure the connection to the wall of the container.

6. A draw-oil and filling connection for a container, having an opening provided therein, comprising, in combination, a central conduit adapted to pass through said opening, a hollow irustoconicalmembercoaxial with said conduit, said membenbeing connected at its end of smallest diameter with said conduit and having the interior portion of its end of largest diameter spaced irom'the conduit and of a diameter larger than said opening, said frusto conical member having a'helical slot extending from one end to the other to serve as a screw for introducing the connection into the opening, said slot extending laterally through the wall of the 'frusto-conical member to avoid increasing the diameter of the opening in the container as the same is threaded into said opening, a clamping member threadedly mounted on saidconduit adaptedvto cooperate with the largest end of the frusto-conical member to secure the connection toythe wall of the container, and means carried by said clamping member for centering said conduit in said opening.

'7. In a device of the character described, a conduit adaptedto be inserted in an opening in a wall of a container, a resilient helical member secured at onejend to said, conduit and having its other end free for resilient movement, said member being adapted to be screwed through the opening in the container wall into the interior of the container, and means carried by saidconduit exteriorly of said container for holding the free end of said resilient member against the interior of the container wall and adapted-to cooperate with-said resilient member for securing said device to said container wall;

8. In a device of the character described, a con adapted to be screwe through the. opening in the container wall into the interior of the container, and means carried by said conduit exteriorly of said c'zontainer for" holding the free end of said resilient member against the interior of the container wall and adapted to cooperate to said container wall;

with said resilient member for securing said device WALTER- HOWIE.

DAVID mcmcmn. 

